210 SPECIES OF THE SYSTEMA. 
and numbered as such, as by his subsequent carelessness it 
eventually appeared, but was distinguished from the rest by a 
cypher, and located between 341 and 342, with the remark, 
that it was introduced lest the shell, which finally assumes the 
features of a Cowry, should puzzle us. 
On examination of No. 359 in the twelfth edition (Cyp. 
spurca), we shall find that the Bulla Cyprea is there claimed 
as a stage of that Mediterranean shell: and, in his revised 
copy, Linneeus has written “eadem” at the conclusion of his 
description. 
Bulla virgiwea. 
The Achatina virginea (Mawe, Conch. t. 22, f. 6) of authors 
is marked for this species in the Linnean cabinet. In his 
revised copy, Linneus has corrected the synonymy by sub- 
stituting 11 for 7, and 15 for 12, in the respective references to 
the works of Petiver and Lister. 
The variety B must be excluded; it is the Achatina vexillum 
of authors. 
Bulla achatina. 
As the majority of the synonyms belong to Achatina perdiz, 
and the fuller description in the ‘Museum Ulrice,’ where 
Gualtier and Argenville alone are quoted, correctly answers to 
the characteristics of that shell (Seba, iii. pl. 71, f. 1), it has 
been generally accepted as the typical Bulla achatina of 
Linneus. Like most very large shells for which there was 
no room in his cabinet, no specimen is preserved in his col- 
lection. The erroneous reference to Petiver has been properly 
erased in the revised copy of the ‘Systema;’ that to Adanson 
must likewise be expelled, for the shell delineated by him suits 
not the described features. Seba, plate 71, figures 4, 5, usually 
quoted for A. zebra, in all probability represented the supposed 
lineated variety particularised by our author. 
